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Related Concept Videos

Bone Remodeling01:40

Bone Remodeling

Bone remodeling is a continuous and balanced process of bone resorption by osteoclasts and bone formation by osteoblasts. In adults, it helps maintain bone mass and calcium homeostasis. While mechanical stress can stimulate turnover as part of the normal maintenance and reparative process, several hormones also regulate bone remodeling.
The Bone Matrix01:18

The Bone Matrix

Bone contains a relatively small number of cells entrenched in a matrix of collagen fibers that provide an adherent surface for inorganic salt crystals. Both components of the matrix, organic and inorganic, contribute to the unusual properties of bone. Without collagen, bones would be brittle and shatter easily. Without mineral crystals, bones would flex and provide little support. This can be observed by an experiment: when the minerals of a bone are dissolved by soaking the bone in acid or...
Compact Bone01:27

Compact Bone

Most bones contain compact and spongy osseous tissue, but their distribution and concentration vary based on the bone's overall function.
Compact bone, also called cortical bone, is the denser, stronger of the two types of bone tissue. It is found under the periosteum and in the diaphyses of long bones, where it provides support and protection. The microscopic structural unit of compact bone is called an osteon, or haversian system. Each osteon is composed of concentric rings of calcified...
Bone Formation by Intramembranous Ossification01:29

Bone Formation by Intramembranous Ossification

Intramembranous ossification is one of the two processes involved in the development of bones within an embryo. The flat bones of the face, most of the cranial bones, and the clavicles are formed via this process. During intramembranous ossification, the bones develop directly from sheets of undifferentiated mesenchymal connective tissue.
The process begins when mesenchymal cells in the embryonic skeleton gather together and differentiate into osteogenic cells, which then develop into...
Bone Remodeling and Repair01:31

Bone Remodeling and Repair

Osteoclasts are cells responsible for bone resorption and remodeling. They originate from hematopoietic progenitor cells present in the bone marrow. Numerous progenitor cells fuse to form multinucleated cells, each with 10-20 nuclei. A single osteoclast has a diameter of 150 to 200 µM. These cells have ruffled borders that break down the underlying bone tissue and release minerals such as calcium into the blood in bone resorption. Osteoclasts cling to bones with their ruffled edges during bone...
Bone Formation by Endochondral Ossification01:24

Bone Formation by Endochondral Ossification

Bone formation, or ossification, begins around the sixth to seventh week of embryonic development. Most bones develop from a cartilaginous template through the process of endochondral ossification. Cartilage formation begins when clusters of mesenchymal cells differentiate into chondrocytes. These chondrocytes proliferate rapidly and secrete an extracellular matrix that becomes encased in a membrane called the perichondrium. The resulting cartilage model provides a template that resembles the...

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Related Experiment Video

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Distinctive Capillary Action by Micro-channels in Bone-like Templates can Enhance Recruitment of Cells for Restoration of Large Bony Defect
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Geometry-Guided Osteogenesis in Bone-on-a-Chip Systems Using Triply Periodic Minimal Surface Scaffolds.

Donggyu Kim1, Giheon Ha1, Minseok Kim2

  • 1Department of Materials Science and Engineering, Pohang University of Science and Technology (POSTECH), Pohang, 790-784, Republic of Korea.

Advanced Healthcare Materials
|October 1, 2025
PubMed
Summary

Optimizing 3D scaffold geometry and fluid flow in a bone-on-a-chip system enhances osteogenic differentiation. Precise pore size and shape are crucial for effective bone regeneration strategies.

Keywords:
bone tissue engineering (BTE)bone‐on‐a‐chip (BoC)fluid shear stresstriply periodic minimal surface (TPMS)

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Area of Science:

  • Biomaterials Engineering
  • Tissue Engineering
  • Mechanobiology

Background:

  • Scaffold geometry and mechanical cues critically regulate osteogenesis in engineered bone.
  • Mimicking native bone physiology requires integrating topological control with physiological flow.
  • Existing strategies often lack precise control over microenvironmental factors.

Purpose of the Study:

  • To investigate how scaffold geometric parameters (pore shape, solidity) influence osteogenic responses under dynamic perfusion.
  • To explore the interplay between scaffold topology and interstitial flow in bone regeneration.
  • To develop a bone-on-a-chip platform for studying bone mechanobiology.

Main Methods:

  • Utilized a bone-on-a-chip (BoC) system with triply periodic minimal surface (TPMS)-based 3D scaffolds (Gyroid, Schwarz diamond).
  • Controlled scaffold pore geometries to modulate wall shear stress (WSS) under dynamic perfusion.
  • Assessed pre-osteoblast infiltration, alkaline phosphatase activity, calcium deposition, and collagen formation.

Main Results:

  • Scaffold geometry significantly influenced pre-osteoblast behavior and osteogenic differentiation.
  • Intermediate scaffold solidity and curvature optimized WSS distribution, enhancing differentiation.
  • A critical pore size threshold was identified, beyond which flow-mediated signaling decreased.

Conclusions:

  • Scaffold topology and interstitial flow synergistically direct osteogenesis.
  • Geometric precision in scaffold design is vital for optimizing flow-mediated signaling.
  • The integrated BoC platform offers a promising strategy for designing biomimetic scaffolds for bone tissue engineering.